Post by thread:[EE:] Audio Switch IC's?

Hi, Does anyone know of a chip that can switch stereo line-level audio signals? I want my pic circuit to be able to switch between two stereo sources, with one output to an amplifier, without nasty crackles or pops. Thanks Jon -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

MAXIM has a chip that will switch audio and video. I don't remember the part number but a company called NCD <A HREF="http://www.controlanything.com">http://www.controlanything.com</A> or <A HREF="http://www.controleverything.com"> http://www.controleverything.com</A> you may also try spam_OUTncdryanTakeThisOuTaol.com. He is the designer of the circuits. If you can't find the infor, contact me offline and I will see if I can get it for you, as I have the sheets here just not at this desk Eddie, kc4awz -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I've used a TEA6300, no idea if it is still available. I found a set of them surplus from a MPEG card on an engineering project at Digital about ten years ago. We didn't need these little audio boards, so they were chucked. On 10th October 1993, says my Forth source, I got them working. They use I2C interfacing; SCL and SDA lines. They had multiple input channels, stereo, volume, tone, and a fader. I was using them on an 80C85 platform, running FigForth. Maybe there are later alternative chips. -- James Cameron .....quozlKILLspam@spam@us.netrek.org http://quozl.netrek.org/ -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I use a cheap, easy to get, CD4016 or 4066. It has four switches that can be controlled by a logic level. Clean switching and ~50db cutoff. I use it to switch audio circuits in broadcast equipment. The 4016 can actually fade up or down. Will work on a single 5 volt supply. If anyone's interested, I can post a schematic. Actually, a j-fet will do the same thing. Rick - Chief Engineer, WTRM-FM "Hulatt, Jon" wrote: > Hi, > > Does anyone know of a chip that can switch stereo line-level audio signals? > I want my pic circuit to be able to switch between two stereo sources, with > one output to an amplifier, without nasty crackles or pops. > > Thanks > > Jon -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Search the Philips and National Semi sites. Some have amplfier built-in. Ling Sm > Does anyone know of a chip that can switch stereo line-level audio signals? > I want my pic circuit to be able to switch between two stereo sources, with > one output to an amplifier, without nasty crackles or pops. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I'd like to see the schematic of a 4016 based fader. Carey ----- Original Message ----- From: "Rick C." <rixyKILLspamVVALLEY.COM> To: <.....PICLISTKILLspam.....MITVMA.MIT.EDU> Sent: Wednesday, December 10, 2003 8:26 AM Subject: Re: [EE:] Audio Switch IC's? > I use a cheap, easy to get, CD4016 or 4066. It has four switches that can be > controlled by a logic level. Clean switching and ~50db cutoff. I use it to > switch audio circuits in broadcast equipment. The 4016 can actually fade up or > down. Will work on a single 5 volt supply. If anyone's interested, I can post a > schematic. Actually, a j-fet will do the same thing. > Rick - Chief Engineer, WTRM-FM > > "Hulatt, Jon" wrote: > > > Hi, > > > > Does anyone know of a chip that can switch stereo line-level audio signals? > > I want my pic circuit to be able to switch between two stereo sources, with {Quote hidden}> > one output to an amplifier, without nasty crackles or pops. > > > > Thanks > > > > Jon > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I'd be interested in getting a copy of the schematic. I have some audio work I'm looking into and this may come in handy. Thank, John --On Wednesday, December 10, 2003 8:26 AM -0500 "Rick C." <EraseMErixyspam_OUTTakeThisOuTVVALLEY.COM> wrote: {Quote hidden}> I use a cheap, easy to get, CD4016 or 4066. It has four switches that can > be controlled by a logic level. Clean switching and ~50db cutoff. I use > it to switch audio circuits in broadcast equipment. The 4016 can actually > fade up or down. Will work on a single 5 volt supply. If anyone's > interested, I can post a schematic. Actually, a j-fet will do the same > thing. > Rick - Chief Engineer, WTRM-FM > > "Hulatt, Jon" wrote: > >> Hi, >> >> Does anyone know of a chip that can switch stereo line-level audio >> signals? I want my pic circuit to be able to switch between two stereo >> sources, with one output to an amplifier, without nasty crackles or pops. >> >> Thanks >> >> Jon > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Add me to the list too please! Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams Carey Fisher - NCS wrote: > > I'd like to see the schematic of a 4016 based fader. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I believe it was the magazine Radio Electronics that once published a home audio switcher. I don't remember the date though. Have you checked out http://www.epanorama.net? He's got tons of stuff, might have something that suits you. Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams "Hulatt, Jon" wrote: > Does anyone know of a chip that can switch stereo line-level audio signals? -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Someone suggested the MAX306/307; I'm using a MAX308 right now to switch what is essentially audio level signals (actually quite a bit larger). Maxim also has a slightly nicer chip, the MAX4508. I haven't been able to find a source for it, though, so YMMV. You may also want to look at the TPA152 or TPA122 audio amplifiers from TI. These have a built-in pop-reduction feature, which allows them to be muted without that characteristic popping sound, and both are stereo output. My idea would be to use the MAX30x chip to switch, then put the TPAxxx chip after that with unity gain. Mute the TPAxxx amp, switch your signal, unmute the amp. Simple. Best part is, all of these chips are available as samples, so if this is a one-off, it'll be easy on the pocketbook! Mike H. {Quote hidden}>Hi, > >Does anyone know of a chip that can switch stereo line-level audio signals? >I want my pic circuit to be able to switch between two stereo sources, with >one output to an amplifier, without nasty crackles or pops. > >Thanks > >Jon > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. _________________________________________________________________ Winterize your home with tips from MSN House & Home. http://special.msn.com/home/warmhome.armx -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Could I get on the list for that schematic too? -Tony jjwspam_OUTSEI.CMU.EDU writes: {Quote hidden}> I'd be interested in getting a copy of the schematic. I have some audio > work I'm looking into and this may come in handy. > > Thank, > John > > --On Wednesday, December 10, 2003 8:26 AM -0500 "Rick C." > <@spam@rixyKILLspamVVALLEY.COM> wrote: > > > I use a cheap, easy to get, CD4016 or 4066. It has four switches that can > > be controlled by a logic level. Clean switching and ~50db cutoff. I use > > it to switch audio circuits in broadcast equipment. The 4016 can actually > > fade up or down. Will work on a single 5 volt supply. If anyone's > > interested, I can post a schematic. Actually, a j-fet will do the same > > thing. > > Rick - Chief Engineer, WTRM-FM > > > > "Hulatt, Jon" wrote: > > > >> Hi, > >> > >> Does anyone know of a chip that can switch stereo line-level audio > >> signals? I want my pic circuit to be able to switch between two stereo > >> sources, with one output to an amplifier, without nasty > crackles or pops. > >> > >> Thanks > >> > >> Jon -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Tony look at google for cd4066 you'll find many links Great chip i use it a lot lately. Tal -----Original Message----- From: pic microcontroller discussion list [KILLspamPICLISTKILLspamMITVMA.MIT.EDU]On Behalf Of RemoveMENaB25JTakeThisOuTAOL.COM Sent: Wednesday, December 10, 2003 9:49 PM To: spamBeGonePICLISTspamBeGoneMITVMA.MIT.EDU Subject: Re: [EE:] Audio Switch IC's? Could I get on the list for that schematic too? -Tony TakeThisOuTjjwEraseMEspam_OUTSEI.CMU.EDU writes: > I'd be interested in getting a copy of the schematic. I have some audio > work I'm looking into and this may come in handy. > > Thank, > John > > --On Wednesday, December 10, 2003 8:26 AM -0500 "Rick C." > <RemoveMErixyTakeThisOuTVVALLEY.COM> wrote: > > > I use a cheap, easy to get, CD4016 or 4066. It has four switches that can > > be controlled by a logic level. Clean switching and ~50db cutoff. I use > > it to switch audio circuits in broadcast equipment. The 4016 can actually {Quote hidden}> > fade up or down. Will work on a single 5 volt supply. If anyone's > > interested, I can post a schematic. Actually, a j-fet will do the same > > thing. > > Rick - Chief Engineer, WTRM-FM > > > > "Hulatt, Jon" wrote: > > > >> Hi, > >> > >> Does anyone know of a chip that can switch stereo line-level audio > >> signals? I want my pic circuit to be able to switch between two stereo > >> sources, with one output to an amplifier, without nasty > crackles or pops. > >> > >> Thanks > >> > >> Jon -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I have the site partially up now. I will give you a detailed example of your circuit you requested on the same site tomorrow. Pardon the hand scribbled schematics. Will clean them up with Orcad in a few days. http://www.pic101.com/audiosw Rick "Hulatt, Jon" wrote: {Quote hidden}> Hi, > > Does anyone know of a chip that can switch stereo line-level audio signals? > I want my pic circuit to be able to switch between two stereo sources, with > one output to an amplifier, without nasty crackles or pops. > > Thanks > > Jon > > -- -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> I have the site partially up now. I will give you a detailed example of your > circuit you requested on the same site tomorrow. > Pardon the hand scribbled schematics. Will clean them up with Orcad in a few > days. > http://www.pic101.com/audiosw Switches using a FET as this does or transmission gates (a number of FETs inside) can have their isolation greatly improved if needed by adding a shorting device across the output (or at an intermediate point). The shorting device is switched in antiphase with the enable device. I had a design that used VERY high power levels and that could tolerate only very low leakage levels. Using a two part switch as above made all the difference. Doing this you may have to pay attention to impedances under various switching conditions. RM -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Correct. That is why the one drawing had a series and shunt fet. To multiplex audio for stereo generation you have to have tight, clean switching. I also designed an IFB system when I worked for NPR that also did that. I will include such a you described for instructional purposes. But for simple switching, what is shown is more than sufficient. I even switched video with no image bleeding using the 4066/4051 and eliminating some of the resistors and capacitors. Rick Russell McMahon wrote: {Quote hidden}> > I have the site partially up now. I will give you a detailed example of > your > > circuit you requested on the same site tomorrow. > > Pardon the hand scribbled schematics. Will clean them up with Orcad in a > few > > days. > > http://www.pic101.com/audiosw > > Switches using a FET as this does or transmission gates (a number of FETs > inside) can have their isolation greatly improved if needed by adding a > shorting device across the output (or at an intermediate point). The > shorting device is switched in antiphase with the enable device. I had a > design that used VERY high power levels and that could tolerate only very > low leakage levels. Using a two part switch as above made all the > difference. Doing this you may have to pay attention to impedances under > various switching conditions. > > RM > > -- -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> switched video with no image bleeding using the 4066/4051 A technique to make a variable resistor with a 4066 gate is to use a control signal that has a variable duty cycle. The effective resistance becomes a function of Ron vs Roff. It's used in things like musical synthesisers for voltage controlled filters, voltage controlled amplifiers and so on. It's a handy way of converting a waveform (that alters the duty cycle of an oscillator) to a varying resistance -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservmitvma.mit.edu with SET PICList DIGEST in the body

> To multiplex audio for stereo generation you have to have tight, clean > switching. Why ? Stereo is sent as L+R and L-R. L-R is L+R-2*R. This requires just one switch and the insulation need not be so good as it can be compensated for by adjusting the gains (of the straight R and of the -2R separately). What am I missing ? Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservEraseMEEraseMEmitvma.mit.edu with SET PICList DIGEST in the body